package com.itheima.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.common.BaseContext;
import com.itheima.common.R;

import com.itheima.pojo.User;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


/*
 * 检查用户是否完成登录*/
@Slf4j
@WebFilter(filterName = "LoginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //filterChain.doFilter(request,response);
        //获取到本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}", requestURI);
        //定义不需要的请求路径
        String[] urls = {
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/login",
                "/user/sendMsg"

        };

        //判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //不需要的话，直接方行
        if (check) {
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        //判断后台登录状态，登录直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户id为{}", request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request, response);
            return;
        }
        //判断前台登录状态，登录直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为{}", request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);
            return;
        }


        log.info("用户未登录");
        //未登录，通过输出流方式向客户端响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;



    }

    /*
     * 路径匹配检查本次请求是否需要放行*/
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }

}
